CN108939770B - Method and device for eliminating associated ozone in outdoor fresh air or indoor air electrostatic dust collection process in situ - Google Patents

Method and device for eliminating associated ozone in outdoor fresh air or indoor air electrostatic dust collection process in situ Download PDF

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CN108939770B
CN108939770B CN201810505496.6A CN201810505496A CN108939770B CN 108939770 B CN108939770 B CN 108939770B CN 201810505496 A CN201810505496 A CN 201810505496A CN 108939770 B CN108939770 B CN 108939770B
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ozone
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electrostatic dust
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CN108939770A (en
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朱天乐
洪威
吕栋
申芳霞
孙也
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Anhui Binken Environmental Technology Co ltd
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Beihang University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
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    • B01D53/8671—Removing components of defined structure not provided for in B01D53/8603 - B01D53/8668
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Abstract

The invention discloses a method and a device for eliminating associated ozone in an outdoor fresh air or indoor air electrostatic dust removal process in situ, and belongs to the technical field of indoor air purification. Firstly, outdoor fresh air or indoor air sequentially passes through a coarse filtration module and an electrostatic dust removal module, the electrostatic dust removal module comprises an ionization region and a dust collection region, and the coarse filtration module is used for removing large particles which easily cause instability in a high-voltage discharge process of the electrostatic dust removal module; particle charging is realized in an ionization region by means of high-voltage discharge; in the dust collecting area, the separation of the particles is realized by means of a high-voltage electrostatic field. The high-voltage discharge of the ionization region generates ozone, and the ozone enters the dust collecting region and is efficiently decomposed into oxygen by the ozone catalytic decomposition material coated on the polar plate, so that the ozone is prevented from entering the indoor environment. The method and the device provided by the invention have the advantages of small airflow resistance, low noise, low energy consumption and the like.

Description

Method and device for eliminating associated ozone in outdoor fresh air or indoor air electrostatic dust collection process in situ
Technical Field
The invention relates to the technical field of indoor air purification, in particular to a method and a device for eliminating associated ozone in an outdoor fresh air or indoor air electrostatic dust removal process in situ.
Background
In recent years, under the influence of atmospheric haze, particulate matters become the most main indoor air pollutants, and the removal of outdoor fresh air and indoor air PM2.5 becomes the most urgent and important functions of an air purifier, so that various air purification technologies such as a photocatalyst, a fiber filtration technology, an electrostatic dust removal technology and the like are promoted. The photocatalyst technology has a certain effect of degrading formaldehyde and benzene series, but the removal efficiency is low and the conversion product is uncertain. Particulate matter such as PM2.5 is not purified, and therefore can be used only as an auxiliary means for air purification. The traditional fiber filtering technology has the problems of high resistance, high energy consumption, small purified air quantity, high running noise, need of replacing consumables at regular intervals and the like, and greatly restricts the application range of the technology in fresh air and indoor air.
The electrostatic dust collection technology is to realize particle charging by utilizing high-voltage discharge and separate charged particles from air flow by means of a high-voltage electrostatic field, so that the PM2.5 is better purified; the charged particles hardly obstruct the air flow in the process of being captured and the air flow resistance is small, so compared with the fiber filtering method, the method has the advantages of large air handling capacity, large dust collection capacity, small pressure loss and low energy consumption. In addition, the dust accumulated on the surface of the dust collecting electrode can be removed by washing, rapping, blowing and the like, so that the electrostatic air purifier can be used for a long time, the dust removing component does not need to be replaced, and the operation and maintenance cost can be reduced. However, in the operation process of the electrostatic dust removal device, ozone is generated due to high-voltage discharge, and the ozone concentration is high to a certain level and can harm the health of human bodies, so the popularization and the application of the electrostatic dust removal device are restricted.
In order to effectively prevent ozone from entering an indoor environment, the prior electrostatic fresh air and indoor air purifier usually adopts a two-stage purification technology, namely, the front stage is used for conventional particle purification, and the rear stage is used for an ozone elimination device. Chinese patent application No. 201720051934.7 discloses a fresh air purification system capable of removing fresh air PM2.5 and ozone. The purification system comprises a coarse filter screen, a charging electric field, a dust collection nest and a honeycomb-shaped base screen coated with a manganese-based catalyst coating for decomposing ozone, and residual ozone can be effectively decomposed, adsorbed and catalytically decomposed in the operation process. Chinese patent application No. 201510482678.2 discloses a constant-current voltage-limiting ultra-low ozone type electrostatic air purifier. The purifier is sequentially provided with an electrostatic dust collection device, an active carbon filter screen and a honeycomb-shaped ozone decomposition filter screen along the flow direction of indoor air; in the electrostatic dust removal device, the generated amount of ozone is reduced by controlling voltage, and then the ozone flows through an active carbon adsorption module and an ozone decomposition filter screen which are arranged at the later stage to effectively adsorb/decompose residual ozone. However, the air purifier has a large gas flow velocity, and the separately added ozone removing device can generate large airflow resistance, so that the purification effect is influenced, the production cost is increased, and the popularization and application of the technology in the air purifier are hindered to a certain extent.
Disclosure of Invention
The invention provides a method and a device for eliminating associated ozone in an outdoor fresh air or indoor air electrostatic dust removal process in situ, aiming at the problems that in the prior art, an activated carbon adsorption material needs to be regenerated or replaced periodically due to the adsorption ablation phenomenon, and a larger air resistance is generated by adding an ozone adsorption or catalytic decomposition device, so that the purification efficiency is influenced, the production cost is increased, and the like.
The method for eliminating the associated ozone in the outdoor fresh air or indoor air electrostatic dust removal process in situ comprises the steps of firstly enabling the outdoor fresh air or the indoor air to sequentially pass through a coarse filtering module and an electrostatic dust removal module, wherein the electrostatic dust removal module comprises an ionization region and a dust collection region, and realizing the efficient removal of particulate matters. The coarse filtering module is used for removing large particles which easily cause instability of the high-voltage discharge process of the electrostatic dust collection module. The dust-containing air treated by the coarse filtering module firstly enters an ionization region of the electrostatic dust removal module, and particle charging is realized by means of high-voltage discharge; then enters a dust collecting area of the electrostatic dust collection module, and realizes the separation of the particles by means of a high-voltage electrostatic field. The high-voltage discharge of the ionization region can generate high-concentration ozone, and the ozone enters the dust collecting region and is efficiently decomposed into oxygen by the ozone catalytic decomposition material coated on the polar plate, so that the ozone is prevented from entering the indoor environment.
The ionization region adopts positive or negative polarity direct current high-voltage discharge, and the voltage of the positive polarity direct current discharge is 6-15 kV; the voltage of the negative polarity direct current discharge is 7-20 kV.
The dust collecting area adopts positive or negative polarity direct current high-voltage discharge, and the voltage of the positive polarity direct current discharge is 4-6 kV; the voltage of the negative polarity direct current discharge is 5-8 kV.
The ozone catalytic decomposition material coated on the polar plate can efficiently decompose ozone flowing into the dust collection area from the ionization area into oxygen, and the decomposition efficiency can reach more than 90%.
The method provided by the invention can effectively solve the problem that ozone generated by high-voltage discharge exceeds standard in the process of electrostatic dust removal of outdoor fresh air or indoor air.
The invention also provides a device for eliminating the associated ozone in the outdoor fresh air or indoor air electrostatic dust removal process in situ. The device is characterized in that a coarse filtering module and an electrostatic dust collection module are sequentially arranged in a main air pipe along the flow direction of outdoor fresh air or indoor air, the electrostatic dust collection module comprises an ionization region and a dust collection region, and an ozone catalytic decomposition material is coated on a polar plate of the dust collection region; one end of the main air pipe is an air inlet, and the other end of the main air pipe is an air outlet; the ionization region is arranged by adopting line-plate or line-tube type electrodes, the distance between the line and the plate or the line and the tube is 10-15mm, the discharge line is a tungsten filament with the diameter of 0.2mm, and the plate and the tube are made of aluminum alloy, stainless steel or copper alloy; the dust collecting area is arranged by adopting plate-plate electrodes, the plate-plate distance is 10-20mm, and the plate is aluminum alloy, stainless steel or copper alloy; the ozone catalytic decomposition material coated on the surface of the dust collecting area plate-plate electrode can be realized by adopting a dip coating or spray coating method. The catalytic ozonolysis material can be coated on a high-voltage electrode of the dust collection area and can also be coated on a grounding electrode of the dust collection area. The carrier of the ozone catalytic decomposition material is active alumina, the active component is manganese oxide, and can be further loaded with silver, wherein the weight content of the alumina is 85-95%, the weight content of the manganese oxide is 5-15%, and the loading amount of the silver is 0.5-2%.
The invention has the advantages that:
1. the invention avoids the problem of air flow resistance in the main air pipe caused by adding the ozone eliminating device, and has the advantages of small air flow resistance, low noise, low energy consumption and the like in the high-treatment air flow operation process.
2. The ozone catalytic decomposition material coated by the invention has little influence on the electric conductivity of the electrode and cannot influence high-voltage discharge.
3. The electrodes applied to the electrostatic dust removal equipment are in narrow electrode spacing, so that dust-containing airflow can be fully contacted with the polar plate, and conditions are created for removing ozone by the ozone decomposition catalytic material loaded on the metal electrodes.
Drawings
FIG. 1 is a schematic diagram of an apparatus for in-situ elimination of ozone associated with an electrostatic dust removal process of outdoor fresh air or indoor air and a process for catalytic decomposition of ozone.
FIG. 2 is a schematic diagram of the device for removing ozone associated with the outdoor fresh air and indoor air electrostatic dust removal process and the ozone catalytic decomposition process thereof in the ionization region with the line-plate type electrode arrangement.
FIG. 3 is a schematic diagram of the device for removing the ozone associated with the outdoor fresh air and the indoor air electrostatic dust removal process and the process for catalytically decomposing the ozone thereof, which adopt the wire-tube type (wire is in the center of two tubes) electrode arrangement ionization region in the invention.
FIG. 4 is a schematic diagram of the device for removing the ozone associated with the outdoor fresh air and indoor air electrostatic dust removal process and the process for catalytically decomposing the ozone thereof, which adopts the wire-tube type (wire is at the center of the circular tube) electrode arrangement ionization region in the invention.
In the figure:
1. a main air duct; 2. a coarse filtration module; 3. an electrostatic dust removal module; 4. a line-plate type ionization region high-voltage discharge electrode;
5. a wire-plate ionization region ground electrode; 6. a line-tube type ionization region high-voltage discharge electrode; 7. a wire-tube ionization region ground electrode;
8. plate-plate dust collection area high voltage electrode; 9. a plate-plate type dust collecting area grounding electrode.
Detailed Description
In order to more clearly illustrate the present invention, the present invention will be described in detail below with reference to the accompanying drawings and examples. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
The invention firstly provides a device for eliminating associated ozone in an outdoor fresh air or indoor air electrostatic dust removal process in situ, as shown in figure 1, a coarse filtering module 2 and an electrostatic dust removal module 3 are sequentially arranged in a main air pipe 1 along the flow direction of outdoor fresh air or indoor air, the electrostatic dust removal module 3 comprises an ionization region and a dust collection region, and an ozone catalytic decomposition material is coated on a polar plate of the dust collection region. Outdoor fresh air or indoor air enters the main air pipe 1 along the air inlet and passes through the coarse filtering module 2 in the main air pipe 1 to remove larger particles in the indoor air; the dust-containing gas is then introduced into an ionization region of the electrostatic dust removal module 3, and charged particles generated by high-voltage discharge charge the particles; then the airflow is processed in a dust collection area of the electrostatic dust collection module 3, and charged particles are separated from the airflow by means of a high-voltage electrostatic field. Ozone generated by high-voltage discharge in the ionization region enters the dust collection region, and is efficiently decomposed into oxygen by virtue of the ozone catalytic decomposition material coated on the polar plate. The clean outdoor fresh air or indoor air treated by the device is discharged from the air outlet of the main air pipe 1 and enters the indoor environment.
The ionization region is arranged by adopting line-plate or line-tube type electrodes, the distance between the line and the plate or the line and the tube is 10-15mm, the discharge line is 0.2mm tungsten filament, and the plate and the tube are made of aluminum alloy, stainless steel or copper alloy.
The dust collecting area is arranged by adopting plate-plate electrodes, the plate-plate distance is 10-20mm, and the plate is made of aluminum alloy, stainless steel or copper alloy.
The ozone catalytic decomposition material coated on the surface of the dust collecting area plate-plate electrode can be realized by adopting a dip coating or spray coating method.
The ozone catalytic decomposition material can be coated on a high-voltage electrode of the dust collection area, can also be coated on a grounding electrode of the dust collection area, or can be coated on the high-voltage electrode and the grounding electrode of the dust collection area simultaneously.
The carrier of the ozone catalytic decomposition material is active alumina, the active component is manganese oxide, and can also be further loaded with silver; wherein, the weight content of the aluminum oxide is 85 to 95 percent, the weight content of the manganese oxide is 5 to 15 percent, and the loading amount of the silver is 0.5 to 2 percent.
The invention also provides a method for eliminating associated ozone in the outdoor fresh air or indoor air electrostatic dust removal process in situ, which comprises the following steps:
in the time period of starting ventilation and purification of a building, outdoor fresh air or indoor air containing particulate matters firstly enters a pre-dedusting area through a main air pipe, and large particles which easily cause instability in a high-voltage discharge process of an electrostatic dedusting area are removed by means of a coarse-effect filtering module. After the dust-containing air is introduced into the electrostatic dust removal area through the main air pipe, particles are removed under the action of a high-voltage electric field; meanwhile, ozone generated by high-voltage discharge in the ionization region enters the dust collection region through the main air pipe, namely, the ozone catalytic decomposition material coated on the polar plate is efficiently decomposed into oxygen, so that the ozone is prevented from entering an indoor environment; the ionization region adopts positive or negative polarity direct current high-voltage discharge, and the voltage of the positive polarity direct current discharge is 6-15 kV; the voltage of the negative polarity direct current discharge is 7-20 kV. The dust collecting area adopts positive or negative polarity direct current high-voltage discharge, and the voltage of the positive polarity direct current discharge is 4-6 kV; the voltage of the negative polarity direct current discharge is 5-8 kV. The ozone catalytic decomposition material coated on the polar plate can efficiently decompose ozone flowing into the dust collection area from the ionization area into oxygen, and the decomposition efficiency can reach more than 90%. If higher dust removal efficiency is required, a high-efficiency fiber filtering module can be additionally arranged behind the electrostatic dust removal area so as to meet the higher purification requirement of fresh air or indoor air.
Example 1
An office is provided with the device for eliminating the ozone associated with the outdoor fresh air electrostatic dust removal process in situ. As shown in fig. 2, a circular a3 steel plate with an inner diameter of 65mm is used as a main air duct 1, a coarse filter module 2 and an electrostatic dust removal module 3 are sequentially arranged in the main air duct 1 along the outdoor fresh air flow direction, the electrostatic dust removal module 3 comprises an ionization region and a dust collection region, the ionization region adopts positive polarity direct current discharge with a voltage of 6kV, electrodes are arranged in a line-plate manner, the discharge line of a line-plate type ionization region high-voltage discharge electrode 4 is a tungsten filament with a thickness of 0.2mm, the plate of a line-plate type ionization region grounding electrode 5 is aluminum alloy, and the line-plate distance is 10 mm; the dust collection area adopts positive polarity direct current discharge with the voltage of 5kV, electrodes are arranged in a plate-plate mode, plates are made of copper alloy, and the plate-plate distance is 10 mm; and manganese oxide with the weight content of 5 percent and active alumina with the weight content of 95 percent are coated on the high-voltage electrode 8 of the dust collecting area in a dip-coating mode to be used as catalytic decomposition materials. The power supply of the device is turned on, outdoor fresh air firstly passes through the coarse filtration module 2 in the main air pipe 1, and large particles which easily cause the instability of the high-voltage discharge process of the electrostatic dust removal module 3 are removed. After the dust-containing air is introduced into the electrostatic dust collection module 3, PM2.5 particles are removed under the action of a high-voltage electric field, and ozone is eliminated in situ by means of an ozone catalytic decomposition material loaded on the surface of a high-voltage electrode 8 in a plate-plate type dust collection area, so that efficient decomposition of ozone is realized. The detection result shows that the concentration of PM2.5 at the inlet is 167 mu g/m3In the process, the purification rate of one-time passing is 89%, and the outlet ozone is not detected.
Example 2
In-situ elimination provided by the invention equipped in a residential dwellingThe device for the indoor air electrostatic dust removal process with ozone. A circular A3 steel plate with the inner diameter of 40mm is used as a main air duct 1, as shown in figure 2, a coarse filtration module 2 and an electrostatic dust removal module 3 are sequentially arranged in the main air duct 1 along the indoor air flow direction, the electrostatic dust removal module 3 comprises an ionization region and a dust collection region, the ionization region adopts positive polarity direct current discharge with the voltage of 15kV, electrodes are arranged in a line-plate mode, the discharge line is 0.2mm tungsten filament, the plate is stainless steel, and the line-tube spacing is 15 mm; adopting positive polarity direct current discharge with 6kV voltage in a dust collection area, arranging electrodes in a plate-plate mode, wherein a plate is made of aluminum alloy, and the plate-plate distance is 20 mm; manganese oxide with the weight content of 10 percent and active aluminum oxide with the weight content of 90 percent are coated on the plate-plate type dust collecting area grounding electrode 9 in a spraying mode to be used as catalytic decomposition materials; the power supply of the device is turned on, indoor air firstly passes through the coarse filter module 2 in the main air pipe 1, and large particles which easily cause instability of the high-voltage discharge process of the electrostatic dust removal module 3 are removed. After the dust-containing air is introduced into the electrostatic dust collection module 3, PM2.5 particles are removed under the action of a high-voltage electric field, and ozone is eliminated in situ by means of an ozone catalytic decomposition material loaded on the surface of the grounding electrode 9 in the plate-plate type dust collection area, so that efficient decomposition of ozone is realized. The detection result shows that the inlet PM2.5 concentration is 172 mu g/m3In the process, the once-through purification rate is 85%, and the outlet ozone is not detected.
Example 3
The device for eliminating the ozone associated with the outdoor fresh air electrostatic dust removal process in situ is arranged in a student dormitory. A circular A3 steel plate with the inner diameter of 45mm is adopted as a main air duct 1, as shown in figure 2, the device comprises a coarse filtration module 2 and an electrostatic dust removal module 3 which are sequentially arranged in the main air duct 1 along the outdoor fresh air flow direction, the electrostatic dust removal module 3 comprises an ionization region and a dust collection region, the ionization region adopts negative polarity direct current discharge with the voltage of 7kV, electrodes are arranged in a line-plate mode, the discharge line is 0.2mm tungsten filament, the plate is copper alloy, and the line-plate distance is 12 mm; the dust collection area adopts negative polarity direct current discharge with the voltage of 5kV, electrodes are arranged in a plate-plate mode, plates are made of stainless steel, and the plate-plate distance is 15 mm; the manganese oxide with the weight content of 1 percent is coated on the plate-plate type dust collecting area high-voltage electrode 8 by adopting a dip coating mode99% of activated alumina is used as a catalytic decomposition material; the power supply of the device is turned on, outdoor fresh air firstly passes through the coarse filtration module 2 in the main air pipe 1, and large particles which easily cause the instability of the high-voltage discharge process of the electrostatic dust removal module 3 are removed. After the dust-containing air is introduced into the electrostatic dust removal module 3 through the main air duct 1, PM2.5 particles are removed under the action of a high-voltage electric field, and ozone is eliminated in situ by means of an ozone catalytic decomposition material loaded on the surface of a high-voltage electrode 8 in a plate-plate type dust collection area, so that efficient decomposition of the ozone is realized. The detection result shows that the inlet PM2.5 concentration is 185 mu g/m3In the process, the purification rate in one pass is 84%, and the outlet ozone is not detected.
Example 4
The device for eliminating the ozone associated with the indoor air electrostatic dust removal process in situ is arranged in a student classroom. A circular A3 steel plate with the inner diameter of 65mm is adopted as a main air duct 1, as shown in figure 3, the device comprises a coarse filtration module 2 and an electrostatic dust removal module 3 which are sequentially arranged in the main air duct 1 along the indoor air flow direction, the electrostatic dust removal module 3 comprises an ionization region and a dust collection region, the ionization region adopts negative polarity direct current discharge with the voltage of 20kV, electrodes are arranged in a line-tube manner, the discharge line of a line-tube type ionization region high-voltage discharge electrode 6 is a tungsten filament with the thickness of 0.2mm, a line-tube type ionization region grounding electrode 7 is a stainless steel tube, the line-tube is arranged at intervals in the vertical air inlet direction, and the line-tube interval is 15 mm; adopting negative polarity direct current discharge with voltage of 8kV in a dust collection area, arranging electrodes in a plate-plate manner, wherein the plate is made of aluminum alloy, and the distance between the plate and the plate is 13 mm; coating manganese oxide with the weight content of 1.5%, silver with the weight content of 0.5% and active alumina with the weight content of 98% on the plate-plate type dust collecting area grounding electrode 9 in a dip-coating mode to serve as catalytic decomposition materials; the power supply of the device is turned on, indoor air firstly passes through the coarse filter module 2 in the main air pipe 1, and large particles which easily cause instability of the high-voltage discharge process of the electrostatic dust removal module 3 are removed. After the dust-containing air is introduced into the electrostatic dust removal module 3 through the main air duct 1, PM2.5 particles are removed under the action of a high-voltage electric field, and ozone is eliminated in situ by means of an ozone catalytic decomposition material loaded on the surface of the grounding electrode 9 in the plate-plate type dust collection area, so that efficient decomposition of the ozone is realized. The detection result shows that the inlet PM2.5 concentration is 153 mu g/m3When is, oneThe secondary pass purification rate was 88%, and outlet ozone was not detected.
Example 5
The device for eliminating the associated ozone in the outdoor fresh air electrostatic dust collection process in situ is arranged in a certain residential building. A circular A3 steel plate with the inner diameter of 50mm is adopted as a main air duct 1, as shown in figure 3, the device comprises a coarse filtering module 2 and an electrostatic dust removal module 3 which are sequentially arranged in the main air duct 1 along the outdoor fresh air flow direction, the electrostatic dust removal module 3 comprises an ionization region and a dust collection region, the ionization region adopts positive polarity direct current discharge with the voltage of 10kV, electrodes are arranged in a line-tube mode, the discharge line is 0.2mm tungsten filament, the tube is a copper alloy tube, the line-tube is arranged at intervals in the vertical air inlet direction, and the line-tube interval is 10 mm; adopting negative polarity direct current discharge with 6kV voltage in a dust collection area, arranging electrodes in a plate-plate mode, wherein a plate is made of copper alloy, and the plate-plate distance is 18 mm; manganese oxide with the weight content of 5%, silver with the weight content of 2% and active alumina with the weight content of 93% are coated on the plate-plate type dust collecting area high-voltage electrode 8 and the plate-plate type dust collecting area grounding electrode 9 in a dip-coating mode to serve as catalytic decomposition materials; the power supply of the device is turned on, outdoor fresh air firstly passes through the coarse filtration module 2 in the main air pipe 1, and large particles which easily cause the instability of the high-voltage discharge process of the electrostatic dust removal module 3 are removed. After the dust-containing air is introduced into the electrostatic dust collection module 3 through the main air duct 1, PM2.5 particles are removed under the action of a high-voltage electric field, and ozone is eliminated in situ by means of an ozone catalytic decomposition material loaded on the surfaces of a high-voltage electrode 8 of a plate-plate type dust collection area and a grounding electrode 9 of the plate-plate type dust collection area, so that efficient decomposition of ozone is realized. The detection result shows that the inlet PM2.5 concentration is 192 mu g/m3In the process, the purification rate in one pass is 84%, and the outlet ozone is not detected.
Example 6
The device for eliminating the ozone associated with the indoor air electrostatic dust removal process in situ is arranged in an office. Adopt the circular organic glass pipe or the nonrust steel pipe of internal diameter for 55mm as main tuber pipe 1, as shown in fig. 4, the device includes in main tuber pipe 1 along the coarse filter module 2 and the electrostatic precipitator module 3 that indoor air flow direction set gradually, and electrostatic precipitator module 3 includes the ionization regionA dust collection area, wherein the ionization area adopts negative polarity direct current discharge with the voltage of 15kV, electrodes are arranged in a wire-tube mode, a discharge wire is a tungsten filament with the diameter of 0.2mm, a tube material is an aluminum alloy tube, a wire is positioned in the tube, and the wire-tube distance is 12 mm; the dust collection area adopts positive polarity direct current discharge with the voltage of 5kV, electrodes are arranged in a plate-plate mode, plates are made of aluminum alloy, and the plate-plate distance is 20 mm; manganese oxide with the weight content of 5%, silver with the weight content of 1.5% and active alumina with the weight content of 93.5% are coated on the plate-plate type dust collecting area high-voltage electrode 8 and the plate-plate type dust collecting area grounding electrode 9 in a dip-coating mode to serve as catalytic decomposition materials; the power supply of the device is turned on, indoor air firstly passes through the coarse filter module 2 in the main air pipe 1, and large particles which easily cause instability of the high-voltage discharge process of the electrostatic dust removal module 3 are removed. After the dust-containing air is introduced into the electrostatic dust collection module 3 through the main air duct 1, PM2.5 particles are removed under the action of a high-voltage electric field, and ozone is eliminated in situ by means of an ozone catalytic decomposition material loaded on the surfaces of a high-voltage electrode 8 of a plate-plate type dust collection area and a grounding electrode 9 of the plate-plate type dust collection area, so that efficient decomposition of ozone is realized. The detection result shows that the inlet PM2.5 concentration is 155 mu g/m3In the process, the purification rate of one-time passing is 86%, and the ozone at the outlet is not detected.

Claims (4)

1. A device for eliminating associated ozone in an outdoor fresh air or indoor air electrostatic dust removal process in situ comprises a coarse filtering module (2) and an electrostatic dust removal module (3), wherein outdoor fresh air or indoor air sequentially passes through the coarse filtering module (2) and the electrostatic dust removal module (3);
the method is characterized in that:
the coarse filtering module (2) is used for removing large particles which easily cause instability of a high-voltage discharge process of the electrostatic dust collection area; the dust-containing air treated by the coarse filtering module (2) enters an ionization region of the electrostatic dust removal module (3) first, and particle charging is realized by means of high-voltage discharge; then enters a dust collecting area of the electrostatic dust collection module (3) and realizes the separation of particles by means of a high-voltage electrostatic field;
the electrostatic dust removal module (3) comprises an ionization region and a dust collection region; the high-voltage discharge of the ionization region can generate high-concentration ozone, and the ozone enters the dust collecting region and is efficiently decomposed into oxygen by the ozone catalytic decomposition material coated on the polar plate, so that the ozone is prevented from entering the indoor environment;
an ionization region of the electrostatic dust removal module (3) is provided with a wire-plate ionization region high-voltage discharge electrode (4) and a wire-plate ionization region grounding electrode (5); or the ionization region of the electrostatic dust removal module (3) is provided with a wire-tube type ionization region high-voltage discharge electrode (6) and a wire-tube type ionization region grounding electrode (7);
the distance between the wire-plate type ionization region high-voltage discharge electrode (4) and the wire-plate type ionization region grounding electrode (5) is 10-15mm, and the discharge wire is a tungsten filament with the diameter of 0.2 mm;
the distance between the wire-tube type ionization region high-voltage discharge electrode (6) and the wire-tube type ionization region grounding electrode (7) is 10-15mm, and the discharge wire is a tungsten filament with the diameter of 0.2 mm;
the wire-plate type ionization region high-voltage discharge electrode (4) and the wire-plate type ionization region grounding electrode (5) are made of aluminum alloy, stainless steel or copper alloy;
the wire-tube type ionization region high-voltage discharge electrode (6) and the wire-tube type ionization region grounding electrode (7) are made of aluminum alloy, stainless steel or copper alloy;
the ionization region of the electrostatic dust removal module (3) adopts positive or negative polarity direct current high-voltage discharge, and the voltage of the positive polarity direct current discharge is 6-15 kV; the voltage of the negative direct current discharge is 7-20 kV;
the dust collecting area of the electrostatic dust collection module (3) is provided with a plate-plate type dust collecting area high-voltage discharge electrode (8) and a plate-plate type dust collecting area grounding electrode (9);
the distance between the plate-plate type dust collecting area high-voltage discharge electrode (8) and the plate-plate type dust collecting area grounding electrode (9) is 10-20mm, and the material is aluminum alloy, stainless steel or copper alloy;
coating ozone catalytic decomposition materials on the surfaces of a high-voltage discharge electrode (8) of a plate-plate type dust collection area and a grounding electrode (9) of the plate-plate type dust collection area by adopting a dip coating or spraying method;
the carrier of the ozone catalytic decomposition material is active alumina, and the active component is manganese oxide loaded with silver;
the dust collecting area of the electrostatic dust collection module (3) adopts positive or negative polarity direct current high-voltage discharge, and the voltage of the positive polarity direct current discharge is 4-6 kV; the voltage of the negative direct current discharge is 5-8 kV.
2. The device for eliminating the ozone associated with the outdoor fresh air or indoor air electrostatic dust collection process in situ according to claim 1, wherein: the weight content of the alumina is 85-95%, the weight content of the manganese oxide is 5-15%, and the loading amount of the silver is 0.5-2%.
3. The device for eliminating the ozone associated with the outdoor fresh air or indoor air electrostatic dust collection process in situ according to claim 1, wherein: the ozone catalytic decomposition material coated on the polar plate decomposes ozone flowing into the dust collection area from the ionization area into oxygen, and the decomposition efficiency reaches over 90 percent.
4. The device for eliminating the ozone associated with the outdoor fresh air or indoor air electrostatic dust collection process in situ according to claim 1, wherein: the ozone catalytic decomposition material is coated on the high-voltage discharge electrode (8) of the plate-plate type dust collection area or the grounding electrode (9) of the plate-plate type dust collection area.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN204678558U (en) * 2015-05-20 2015-09-30 董坤 A kind of electrostatic spray fresh air purification device
CN107376931A (en) * 2017-03-22 2017-11-24 傅国琳 A kind of solid catalyst and preparation method and purposes
CN206996856U (en) * 2017-09-11 2018-02-13 广东美的制冷设备有限公司 Electrostatic precipitation module and conditioner

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN204678558U (en) * 2015-05-20 2015-09-30 董坤 A kind of electrostatic spray fresh air purification device
CN107376931A (en) * 2017-03-22 2017-11-24 傅国琳 A kind of solid catalyst and preparation method and purposes
CN206996856U (en) * 2017-09-11 2018-02-13 广东美的制冷设备有限公司 Electrostatic precipitation module and conditioner

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